Digital camera capable of recording and reproducing video signal

Abstract

A digital camera that records and reproduces an external video signal is provided. The digital camera includes: a still image processing unit that generates a still image data by photographing a subject; a video processing unit that receives the external video signal, and generates moving picture data; a memory card on which the still image data and the moving picture data are recorded; a displaying unit that outputs the still image data and the moving picture data; and a controlling unit that compresses the generated moving picture data and records the moving picture data on the memory card, and outputs the moving picture data stored in the memory card to the displaying unit after restoring the moving picture data.

1 . A digital camera for recording and reproducing still image data generated by photographing a subject, and for receiving, recording and reproducing an external video signal, the digital camera comprising: 
 a still image processing unit that generates the still image data by photographing the subject;    a video processing unit that receives the external video signal, and generates moving picture data;    a memory card on which the still image data and the moving picture data are recorded;    a displaying unit that outputs the still image data and the moving picture data; and    a controlling unit that compresses the generated moving picture data and records the moving picture data on the memory card, and outputs the moving picture data stored in the memory card to the displaying unit after restoring the moving picture data.    
   
   
       2 . The digital camera of  claim 1 , wherein the video processing unit comprises: 
 a receiving unit that receives the external video signal; and    a video signal converter that converts the received external video signal into a luminance signal and a color difference signal.    
   
   
       3 . The digital camera of  claim 2 , wherein the receiving unit comprises: a tuner that receives a tuning control signal from the controlling unit, selects a specific channel based on the signal received from the controlling unit, receives a public broadcasting signal for that selected channel and outputs an intermediate frequency signal of the video signal for that specific channel; and an intermediate frequency processor that converts the selected video signal of the specific channel into an RGB baseband composite video signal; and wherein the video signal converter is adapted to convert a received RGB composite video signal into a luminance signal and a color difference signal.  
   
   
       4 . The digital camera of  claim 1 , wherein the controlling unit comprises: 
 a sub-sampling module that receives the luminance signal and the color difference signal and reduces the color difference information of the color difference signal; and    a compressing module that compresses the luminance signal and the reduced color difference signal and generates the moving picture data; and wherein the controlling unit records the compressed moving picture data on the memory card.    
   
   
       5 . The digital camera of  claim 4 , wherein the controlling unit comprises a restoring module that restores the luminance and the reduced color difference signal from the compressed moving picture data, receives the compressed moving picture data from the memory card, and outputs the compressed moving picture data to the displaying unit.  
   
   
       6 . The digital camera of  claim 1 , wherein the video processing unit further comprises an audio/video input terminal that can receive an RGB composite video signal from an external device.  
   
   
       7 . The digital camera of  claim 1 , further comprising an interface that outputs the moving picture data converted from the external video signal or the moving picture data stored in the memory card.  
   
   
       8 . A digital camera for recording and reproducing still image data generated by photographing a subject, and for receiving, recording and reproducing an external video signal, the digital camera comprising: 
 a still image processing unit that generates the still image data by photographing the subject;    a video processing unit that receives an external video signal having a predetermined original resolution, and generates moving picture data;    a memory card on which the still image data and the moving picture data are recorded;    a displaying unit that outputs the still image data and the moving picture data according to a predetermined displaying resolution; and    a controlling unit that reduces the generated moving picture data to correspond to the displaying resolution of the displaying unit and records the moving picture data on the memory card, and outputs the moving picture data stored in the memory card after being reduced to the displaying unit.    
   
   
       9 . The digital camera of  claim 8 , wherein the video processing unit comprises: 
 a receiving unit that receives the external video signal; and    a video signal converter that converts the received external video signal into a luminance signal and a color difference signal.    
   
   
       10 . The digital camera of  claim 9 , wherein the receiving unit comprises: 
 a tuner that receives a tuning control signal from the controlling unit, selects a specific channel based on the signal received from the controlling unit, receives a public broadcasting signal for that selected channel, and outputs an intermediate frequency signal of the video signal for that specific channel; and    an intermediate frequency processor that converts the selected video signal of the specific channel into an RGB composite video signal, which is a baseband video signal; and wherein the video signal converter is adapted to convert the received RGB composite video signal into a luminance signal and a color difference signal.    
   
   
       11 . The digital camera of  claim 10 , wherein the controlling unit comprises a resolution module that receives the luminance signal and the color difference signal and reduces the luminance signal and the color difference signal of the original resolution in a predetermined ratio that corresponds to the displaying resolution of the displaying unit; and wherein the controlling unit records the moving picture data having reduced resolution on the memory card.  
   
   
       12 . The digital camera of  claim 11 , wherein the resolution module reduces n horizontal and vertical pixels of the original resolution of the luminance signal and the color difference signal into one horizontal and vertical pixel of the displaying resolution.  
   
   
       13 . The digital camera of  claim 8 , wherein the video processing unit further comprises an audio/video input terminal that can receive an RGB composite video signal from an external device.  
   
   
       14 . The digital camera of  claim 8 , further comprising an interface that outputs the moving picture data converted from the external video signal or the moving picture data stored in the memory card.  
   
   
       15 . A method of operating a digital camera capable of still image photography for receiving an external video signal and displaying a moving picture image corresponding to the video signal, said method comprising the steps: 
 receiving an external video signal;    generating moving image data from the video signal;    recording the moving image data on a recording medium; and    reproducing said moving image data on a display.    
   
   
       16 . The method of  claim 15  further comprising the step of converting and compressing said moving image data after said generating step.  
   
   
       17 . The method of claim of  claim 15  where the external video signal is a high resolution video signal from a public broadcasting device, the method further comprising the steps of converting and compressing the moving image data after said generating step so as to record low resolution moving image data corresponding to a low resolution display of the digital camera.